diff options
| -rw-r--r-- | src/northbridge/intel/i945/raminit.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/src/northbridge/intel/i945/raminit.c b/src/northbridge/intel/i945/raminit.c index 8b7ffa148b..a9e4a910e2 100644 --- a/src/northbridge/intel/i945/raminit.c +++ b/src/northbridge/intel/i945/raminit.c @@ -3192,9 +3192,33 @@ void sdram_initialize(int boot_path, const u8 *spd_addresses) unsigned long get_top_of_ram(void) { - /* This will not work if TSEG is in place! */ - u32 tom = pci_read_config32(PCI_DEV(0,2,0), 0x5c); + u32 tom; + if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & ((1 << 4) | (1 << 3))) { + /* IGD enabled, get top of Memory from BSM register */ + tom = pci_read_config32(PCI_DEV(0,2,0), 0x5c); + } else { + tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24; + } + + /* if TSEG enabled subtract size */ + switch(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAM)) { + case 0x01: + /* 1MB TSEG */ + tom -= 0x10000; + break; + case 0x03: + /* 2MB TSEG */ + tom -= 0x20000; + break; + case 0x05: + /* 8MB TSEG */ + tom -= 0x80000; + break; + default: + /* TSEG either disabled or invalid */ + break; + } return (unsigned long) tom; } |